Note: Certain nodes in the above example have combined check results, such as memory/virtual, memory/swap, and processes. Be aware that the service module is cAsE SeNsative, you can overcome this with the match= argument. I'd like to use the command line to run that particular check and get the output. In both the cases, the idea is that Nagios receives information about host statuses over the external commands pipe. The following is an example of the required configuration for a host that accepts passive checks and has active checks disabled: Configuring services is exactly the same as with hosts. Syntax and Options Next, update the remote Docker daemon DNS details on your hosts file if there is no local DNS; sudo tee -a "192.168.59.48 docker01.kifarunix.com docker01" >> /etc/hosts. Check whether a document is older than x seconds. Far better then Nagios documentation. If youve installed Nagios from source, check_httpd command will be located in the /usr/local/nagios/libexec directory. This is a plugin for Nagios wich you can use to check if a linux service is running. Nagios can monitor DNS service by asking the DNS server to either resolve a specific fully qualified domain name (FQDN), or by asking the server to use the dig tool. The default FQDN used for testing is www.google.com, but it can be changed as needed. The scripts stored in /etc/nagios-plugins/config/ can shed some light on the awesome capabilities of Nagios. You can submit passive (means Nagios is not the inventor of the actual check commands) check results to a Nagios server instead of having the Nagios actively polling. It is a protocol that is used in reverse of the other common Nagios protocol NRPE. This can be done to gather all critical errors to a single, central place. Yeah, it's totally brute-force, but it works for me. As mentioned earlier, Nagios can forgo the actual execution of an on-demand service check if it can use the cached results from a relatively recent service check. First, install the Nagios Core server. To check whether a specific webpage is available, use the -u option as shown below. Establish a terminal session to your Nagios XI server and execute the following command: nagiosrpm. Services are checked by the Nagios daemon: At regular intervals, as defined by the check_interval and retry_interval options in your service definitions. Use Hiera. In Nagios, 2 types of checks are performed on hosts and services . I will leave this script with all the other Nagios plugins inside /usr/local/nagios/libexec/ (This directory may be different depending on your confiugration). Up To: Contents This is where the location of Nagios log file, status.dat file, lock file and host and services state update interval is defined. Nagioshttpdgccgd. The figure shown below shows a passive check . The daemon will listen for connections from remote clients, perform some basic validation on the results being submitted, and then write the check results directly into the external command file (as described above). The plugins can be in any language, Nagios only cares They can be the following: 0: OK Kaydolmak ve ilere teklif vermek cretsizdir. Sometimes I find it tricky figuring out exactly what a plugin is doing. Nagios can monitor different mail server components like SMTP, POP, IMAP and mailq. Based on the condition checked, the plugin can make Nagios aware of a malfunctioning service. You can define service execution dependencies that prevent Nagios from checking the status of a service depending on the state of one or more other services. This is a plugin for Nagios wich you can use to check if a linux service is running. # Sample object config file for Nagios : 3 # 4 # Read the documentation for more information on this configuration file. # These are some example service check commands. More information on dependencies can be found here. The object needs to have the passive_checks_enabled option set to 1 for Nagios to accept passive check results over the command pipe. Now in your configuration for checks for a host you can create the following service check. On a finishing note, Nagios can monitor many other sectors of a network. Nagios also offers a way of combining the benefits of both active and passive checks. Start Nagios Daemon Using nagios -d Typically you would execute "service nagios start" to start the Nagios daemon, which really calls the /etc/rc.d/init.d/nagios script. Service state changes can also trigger on-demand host checks. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? In such a case, checks are done by other programs, and their results are sent to Nagios. rev2023.3.3.43278. You do this with nagios -v command as root: Ensure it returns 0 errors and 0 warnings and proceed to reload the service: After reloading the service, you will see the associated check in the localhost. When defining and testing new services in nagios I have been restarting nagios, then clicking the service, and rescheduling a check for as soon as possible, then waiting until the check happens. . NSClient++ allows you to check multiple services, here is an example that checks for two services that are running. Please note that this article is published by Xmodulo.com under a Creative Commons Attribution-ShareAlike 3.0 Unported License. In most cases you'll use Nagios to monitor your hosts and services using regularly scheduled active checks. Can I tell police to wait and call a lawyer when served with a search warrant? Some of the scripts provided with Nagios are restricted to the local server only. It allows the implementation of plugins, developed by the community, or even allows us to configure our own monitoring scripts. Force a check and you will see exactly how the command is being run. Examples: CPU load, RAID status An snmp system is generally considered to have 3 components: Agents Agents expose management information on a device. The method for using any of these "plugins" from the command line is the same as any other Linux script: Just run "./plugin-name" with the appropriate flags you want to check, and voila! Scheduled service checks are run in parallel. How to Write a Custom Nagios Check Plugin, /usr/local/nagios/etc/objects/commands.cfg, /usr/local/nagios/etc/objects/localhost.cfg, /usr/lib/nagios/plugins/check_users -w 5 -c 10, /usr/local/nagios/etc/objects/nrpeclient.cfg, Generic installation on Debian-based Client, Set the NRPE Check on the Server Configuration Files, Develop Network Applications for ESP8266 using Mongoose in Linux, How to Setup IKEv2 IPSec VPN Using strongSwan and Let's Encrypt on Rocky Linux 9, ISPConfig Perfect Multiserver setup on Ubuntu 20.04 and Debian 10, Generating Web Site Statistics With AWStats & JAWStats On Debian Lenny, How to Install Jitsi Video Conference Platform on Debian 11, How to Install LAMP Server Stack on Ubuntu 22.04, How to use grep to search for strings in files on the Linux shell, You have Nagios installed and running (You can follow this. You have entered an incorrect email address! This tutorial was tested using Nagios Core 4.3.4 on Debian 9.2if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'howtoforge_com-box-3','ezslot_3',106,'0','0'])};__ez_fad_position('div-gpt-ad-howtoforge_com-box-3-0'); Even though Nagios Exchange has thousands of available plugins to freely download, sometimes the status needed to be checked is very specific for your scenario. Service or Daemon checks are system processes that run in the background, usually configured to start when the system boots. For example . this is THE MOST comprehensive and straight forward turorial I've seen. And in Puppet agent, I have to define the environment (Dev, Test or Prod). Nagios, the Nagios logo, and Nagios graphics are the servicemarks, trademarks, or registered trademarks owned by Nagios Enterprises. How to install and configure Nagios Core. You can create a host file inside the server directory of Nagios and mention the host and service definitions. Add the file to the standard Nagios Core location, /usr/local/nagios/libexec. The Nagios plugin can be remotely executed on other Linux/Unix machines using NRPE. These state changes result in different state types (HARD or SOFT), which can trigger event handlers to be run and notifications to be sent out. NSClient++ includes a service module that can check if a service is running. Note: A host must be defined in Nagios before you can submit passive check results for it! This setting will expose MySQL to all available interfaces, including WAN. This is the main configuration file of Nagios core. Indicate content type in header for POST request, Regular expression can span to new line (Use this with -r or -R option), Use this regular expression to search for string in the HTTP page, If the site user basic authentication send uid, pwd in the format uid:pwd. I just used that simple script as an example, any language can be used to write your own custom plugin. In many cases, the time taken is not enough, as some checks need to be performed over a longer period of time to have satisfactory results. Force a check and you will see exactly how the command is being run. Even if its parent host is currently DOWN, the child host state is also stored as DOWN. A command to submit passive checks is PROCESS_SERVICE_CHECK_RESULT (visit http://www.nagios.org/developerinfo/externalcommands/commandinfo.php?command_id=114). These are executed on regular intervals, as defined by check_interval and retry_interval. Another difference is that active checks require much less effort to be set up when compared to passive checks. Note: A service must be defined in Nagios before you can submit passive check results for it! External applications can submit passive host check results to Nagios by writing a PROCESS_HOST_CHECK_RESULT external command to the external command file. This will give an idea on whether the execution will be successful and what the output of the script will look like. On-demand service checks are also run in parallel if needed. On any device & OS. Now let us add check_interval directive. Thank you for any assistance you can provide. Once the host and services are configured on Nagios, checks are used to see if the hosts and services are working as they are supposed to or not. This mechanism includes password protection, along with encryption, to prevent injection of false results in to Nagios. That is superb artile I was looking for! Do whatever you want with a Deploying Nagios Monitoring Services on Secured Red Hat Enterprise Linux 3 Environment: fill, sign, print and send online instantly. All other servicemarks and trademarks are the property of their respective owner. vegan) just to try it, does this inconvenience the caterers and staff? Use Puppet environments. There are several different use cases covered in this KB article: The sections below provide examples of how to perform these checks using different methods. Enter file in which to save the key (/home/nagios/.ssh/id_dsa): Enter passphrase (empty for. 1 check_http -p 8083 - user4556274 Jul 29, 2016 at 12:49 Add a comment 3 Answers Sorted by: 3 You can specify the port number directly in the command but you will must create one command per tested port. Nagios: Simple Oracle Check. Nagios can detect when services start flapping, and can suppress notifications until flapping stops and the service's state stabilizes. Nagios, NagiosXI, Nagios Core, Nagios Logger, Manage Engine, Idera, Quest, Thousand Eyes Idera Suite and Quest, SQL Monitoring Solution Implementation More information on how this works can be found here. I am gettinr this error in nagios3. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? More information on the flap detection logic can be found here. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. So in the server set the files: /usr/local/nagios/etc/objects/commands.cfg: /usr/local/nagios/etc/objects/nrpeclient.cfg: Note that the ! While Nagios can monitor multiple OSes, the server must reside on a Linux or Unix variant such as FreeBSD or Solaris. How can I make Status Information for Nagios services easier to read? ##### # Sample object config file for Nagios # # Read the documentation for more information on this configuration file. Default is 80, This will use HTTPS using default 443 port. Here is my configuration : notifications_enabled 0 This article assumes you have a working knowledge of Nagios. When it comes in as a passive check, no state translation is done and Nagios stores the host and all child nodes being down. If you would like to use the whole or any part of this article, you need to cite this web page at Xmodulo.com as the original source. Select check_cluster from the plugin pop-up menu. But today when I am trying to post an XML message to the server, from console it works well but does not work with nrpe. service_description check http://MYIP/test.php Enable and restart the nrpe service: [user@mon]# systemctl enable nrpe [user@mon]# systemctl restart nrpe. The following line is commented out to make MySQL listens on all interfaces. Each server runs one or more common services. Plugin then gets executed on the remote machine where is collects the required information and sends then back to Nagios daemon. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Test Server 1: custom application (TCP Port. if one of my checked systems goes down, and therefore fails a PING check, I do NOT need to be notified that a file system is unavailable, or that SSH is down, too. You know the basics on Nagios administration. For this reason, the only way to perform such a check is to schedule them from the systemfor example, using the cron daemon (visit http://man.linuxquestions.org/index.php?query=cron). The key features of passive checks are as follows: The major difference between active and passive checks is that active checks are initiated and performed by Nagios, while passive checks are performed by external applications. ##### ##### # # SAMPLE SERVICE CHECK COMMANDS # # These are some example . From the GroundWork Monitor menu, selecting Configuration > Nagios Monitoring > Services > Service Templates presents the options New, Copy, and Modify. These are examples of the graphs that can be created and embedded using the graph generator in the Graphs tab. I will use a simple example. Nagios is the most popular tool which is used to monitor hosts and services running in your IT infrastructure. Often, there are situations where active checks obviously fit better. . This is how your host definitions look currently . Based on whether the read was successful or not, the appropriate status code, along with plugin output, is sent out. Current status from nagios Web interface: Thank you article really help a beginer like me ;-). Nagios will be configured to monitor SMTP and mail queue of the server. If I used the first method, I have to keep separate site.pp for each environment. The following settings are done for all MySQL servers. Does anyone have a working example of a dependencies.cfg file for nagios? You can tell Nagios to translate DOWN/UNREACHABLE passive check result states to their "proper" state by using the translate_passive_host_checks variable. sudo usermod -aG docker kifarunix. Nagios Core and Nagios XI has a features to monitoring website URL status. As with submitting host check results, it is worth mentioning that Nagios will take some time to process passive check results as they are polled periodically from the external commands pipe. 5 check_http examples Even the location of the plugins directory is in there. What you are doing down is sending a Passive check result for the service SNMP Traps - Users for the host CentOS. @sunardo I just ran into this exact same thing. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Monthly digest of what's new and exciting from us. They have a lot of advantages and some disadvantages. To do this: Navigate to Configuration > Command > New. Format is minimum:maximum, Response time in seconds for warning state, Response time in seconds for critical state, Number of seconds to wait before connection times out. For example, when a web application cannot connect to the database, it will let Nagios know about it immediately. It's pretty simple. # Nagios Exit Codes OK=0 WARNING=1 CRITICAL=2 UNKNOWN=3 # Weather or not we can trust the exit code from the service management tool. Nagios's primary mode of "service checking" is called an active check. Securely download your document with other editable templates, any time, with PDFfiller. We want Nagios to monitor this database, and as the application is already using it, we can add a module that reports this to Nagios. When Nagios needs to run a scheduled service check, it will initiate the service check and then return to doing other work (running host checks, etc). Passive service checks are often used to report the results of long lasting tests asynchronously. Get your subscription here. Asking for help, clarification, or responding to other answers. Also, MySQL would not let just any host to connect to it. I've: 5 # provided some comments here, but things may not be so clear without further . use generic-service ; Name of service template to use . $ check_http -H 192.168.1.50 HTTP OK HTTP/1.1 200 OK - 332 bytes in 0.004 seconds |time=0.004144s;;;0.000000 size=332B;;;0 2. Ensure that the local file and .d directory are included in the main configuration file with: Now check one of the previously defined NRPE commands from the Nagios server: Note that the check_users NRPE command was defined in the /etc/nagios/nrpe_local.cfg file to run /usr/lib/nagios/plugins/check_users -w 5 -c 10. Nagios Core is an Open Source system for monitoring hosts, networks and services. Find the plugin you want to run (if you're not sure, compare what you see in your plugins directory on your Linux box with the plugins located here: http://exchange.nagios.org/directory/Plugins, or try running "./plugin-name -h" to get the help info about the plugin). Here is an example set of passive checks that . In such a case, adding a module that reports current utilization along with the OK/WARNING/CRITICAL state to Nagios seems much easier than using active checks for the same job. Passive checks are performed by external processes and the results are given back to Nagios for processing. Giving material.angular.io a refresh from Angular Blog Medium. . Thus, the difference between active and passive check is that active checks are run by Nagios and passive checks are run by external applications. It is called NSCA (Nagios Service Check Acceptor). In this tutorial, we'll install Nagios on an Ubuntu 19.10 server, but these steps should work on any Debian-based distro. Nagios understands the following exit codes: A program can be written in any language to work as a Nagios check plugin. The check_init_service plugin does not support checking multiple services. The next time Nagios reads the external command file it will place the results of all passive checks into a queue for later processing. Stop once the headers are downloaded. To figure this out I set nagios into debug mode with the configuration like this. Testing the Commands from Nagios XI Server Now we will test from the Nagios XI server that the command you just added to the NRPE client on the Linux server is working. The basic workings of service checks are described here Services are checked by the Nagios daemon: On-demand checks are performed as part of the predictive service dependency check logic. http://exchange.nagios.org/directory/Plugins, linux.about.com/library/cmd/blcmdl1_watch.htm, How Intuit democratizes AI development across teams through reusability. In order to allow remote hosts to send passive check results to the monitoring host, I've developed the NSCA addon. Method 3. It is possible to configure Nagios so that it will receive status information sent over a command pipe. I wrote a plugin in a bash script to check for current Warnings. The best answers are voted up and rise to the top, Not the answer you're looking for? The NSCA addon consists of a daemon that runs on the Nagios hosts and a client that is executed from remote hosts. If a service is set up with a max_check_attempts directive of 5, then the same number of passive check results would need to be passed in order for Nagios to treat the new status as a hard state change. define service{ Nagios will still handle all notifications, event handlers, and dependencies between hosts and services. Hi, this is a fantastic article, i managed to learn how to make plugins myself. (1)Nagios. -c 7 -w 5 -v. Any pointer if I am missing anything but obvious. The plugin returns a CRITICAL state if the service is not started. Also, depending on your configuration you should add this last file to the main file (/usr/local/nagios/etc/nagios.cfg): Check the configuration and, if no errors or warnings, reload the service: And now you have a new custom check on a host: Nagios has a huge library of plugins available at Nagios Exchange. If an application that resides on the same host as Nagios is sending passive host or service check results, it can simply write the results directly to the external command file as outlined above. Nagios also offers a tool for sending passive check results for hosts and services over a network. In this example we are going to define a service and assign it to localhost, because this check is on Nagios itself. To learn more, see our tips on writing great answers. Code-GPT is an extension for VS Code that provides you instant explanations for your code within the code editor using AI. It allows to configure alerts and has different states for them. For those unfamiliar with Nagios, it is a monitoring system which can execute checks. Add additional tags that should be sent in the HTTP header. We make use of First and third party cookies to improve our user experience. They are a web interface and command line tool set to work with Nagios config that have decent default templates and "example" files that you can leverage for common checks. The figure shown below shows an active check . Making statements based on opinion; back them up with references or personal experience. Copyright (c) 1999-2014 Nagios Plugin Development Team <devel@nagios-plugins.org> This plugin tests the HTTP service on the specified host. A good example of such a test is checking whether there are bad blocks on a disk. The output indicates that it expires in 300 days. Once the host and services are configured on Nagios, checks are used to see if the hosts and services are working as they are supposed to or not. This is because, very often, passive checks are used to report host and service statuses from other Nagios instances. NSClient++ includes a service module that can check if a service is stopped. Then we are removing spaces using sed and finally cut the appropriate field using cut, i this case field 5 is what we want. Add the command to the NRPE configuration file on the client (/etc/nagios/nrpe_local.cfg): Now we can access the server and test it like any standard plugin. Learn more about Stack Overflow the company, and our products. When Nagios checks the status of services, it will be able to detect when a service changes between OK, WARNING, UNKNOWN, and CRITICAL states and take appropriate action. Edit the /usr/local/nagios/etc/objects/localhost.cfg file and add the following block: Now we are all set, the only thing pending is reloading Nagios to read the configuration files again.
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